Ok, i've got two posts. In this one I've attached a picture which shows the bone weight shade, so you can see that theres something going on there, I'm just not sure how to fix it. Isn't there some way to paint onto the model to make the white area blue as well? (Just a Guess)
And in the second post below i've attached a zip file with the scene file and the object. Hope you manage to solve it!